Nanoscale graphene oxide sheets (NGO), as activated carbocatalysts, were synthesized by a reduction size strategy and used in chemoselective oxidative conversion of benzylic C−H to the corresponding carboxylic acid. On the basis of the results of the optimization process of different parameters, 3 equiv of H 2 O 2 for each C−H group, 100 wt % of NGO in aqueous medium, acetone as a cosolvent, and a reaction temperature of 100 °C were selected as optimum parameters. In this optimum condition, xylenes and toluene over 24 h with good yield were converted to the corresponding carboxylic acid, and in the case of diphenylmethane and ethylbenzene, these substrates with excellent yield were converted to benzophenone and acetophenone.

No abstract

LiAlH 4 /silica chloride system was used as an efficient and chemoselective reductant for organic substrates. The reduction of phosphine oxides was achieved with this system. Good chemoselectivity in reduction of aldehydes and ketones in the presence of other carbonyl compounds was observed.

Halogenation O 0235 HIO 4 /Al 2 O 3 as a New System for Iodination of Activated Aromatics and 1,3-Dicarbonyl Compounds. -The combination is highly efficient for the regioselective monoiodination of electron-rich arenes, diiodination of activated methylene compounds and monoiodination of a variety of related activated alkenes. -(KHALILZADEH*, M. A.; HOSSEINI, A.; SHOKROLLAHZADEH, M.; HALVAGAR, M. R.; AHMADI, D.; MOHANNAZADEH, F.; TAJBAKHSH, M.; Tetrahedron Lett. 47 (2006) 21, 3525-3528; Dep. Chem., Islamic Azad Univ., Qaemshahr, Iran; Eng.) -Mais 34-036